4-1
Spindle motor does not move
Yes
Yes
No
No
No
No
Yes
Check whether “RFA5V”
(+5V) voltage is normal.
Correct connection
Check the RFA5V power
supply
Check/Replace Q2ǃQ3.
Check/ Replace U1.
Have no focus
1. Check U1 182pin
FOCUS_PWM signals
2.If there are F+, F-, T+ and T-
signals output from U7.
Check/Replace the loader
Yes
Yes
No
Go
Check whether laser voltage
(2.3V for DVD & 1.9V for CD) on
Collector of Q2 and Q3
Check the FFC connection
between 24P and the loader.
1.Whether voltage on pin 129 of
U1 varies between 0 and 3.3V
(3.3V for CD and 0V for DVD),
2.Whether peripheral components
are eroded or badly soldered
Trouble shooting chart
Motor no move
FOCUS_PWN waveform
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